Electric switch



erna

GEORGE H.` CHAPMAN,

or CHICAGO, iLrQrNors.

ELECTRIC SWlICHr To all whom t may concern:

Be it known that' l, GEORGE rul Improvements in Electric Switches, or

which the following is a specification.

\ This invention relates to an electric switchA more especially designed for recording stop combinations on organs, but capable of use as a circuit controlling switch in other relations. A i

Among the leading objects or the invention are, to provide aA switch-or the rotary type which fwill avoid any twisting or turning `movement or the permanently connected to the switch, thus avoiding breakingof the'wir'e through repeated bending; to provide a switch or the lrotary type capable or turning between two spaced contact strips or platesV which willhave a positive spring pressurel contact with either or said strips or plates or maybe turned to aninterniediate or neutral position between Ythem; to provide a switch wherein perfect electric contact will at all times exist, unaffected by swelling or shrinking or the wood or the recording switchboard or. variati-ons inthe length or the osw'itch stein, or thickness or the' wood; v.to provide a type or `switch permitting voi: grouping a. plurality close centers on the recording switch-board; and to provide a switch which cannot be damaged or incapacitated by pull or tension from the rront-a fault existing in most or the recorder switches now in use, in which the switch can be carelessly or accidentally lifted so high that the spring tension is `destroyed. 1

These, and other objects and advantages or the invention, will be apparent to persons skilled in the art as the saine becomes better understood by reference to theV rolthe accompanying drawing in which l: have illustrated one practical embodiment or the invention, and wherein- `ll`ig.11 is a front elevation or a portion or Fig. l is a perspective detail or an end H. CHAP'MAN a citizenof the United States, residing at A,

circuit wire which is or switches on very.

"lowino descri tion takenvin connection with i Appiiauon inea Mai-ch 16, 1922. sei-iai No. 544,129.

portion or one or' the Contact strips showing an upwardly struck lug to which the cirlcuit wire is soldered; and

Fig. 5 is a detail eleva-tion or the switch 60 post.

Referring to the drawing, 6 designates the recorder boa-rd or a pipe organ construction, to the race or which are secured one or more pairs of flat parallel copper strips 7 and 8; two suoli pairs being shown. Each strip, in practice, is connected toa circuit wire leading through a Vstop operating magnet, as' hereinafter described. Between the contact strips 7 and 8 theboard G is bored to receive round switch posts 9, each or which latter has a widened and attened upper end portion -10 forming a turning knob or handle. From the meta-l or the knob 10 there is cut and bent downwardlya rectangular offset ringer or prong 11, the Jfree end or which is adapted, under a turningmovement or the post, to make Contact with either of the strips 7 and 8 or with the surface or the board between the strips.

' Un the back or the board 6 are laid a pair or circuit wires 12 and 13 leading from a source or' current through stop operating magnets. rThese wires are passed through holes le inthe board and soldered at their respective ends to upstanding lugs or tongues 15, (Fig. il) punched from the strips 7 and S. 0n the backv or the board are also laid a series or circuit wires 16 from the other side of the battery or other current generator. Each or the wires 16 is'connected to an integral arm'17 or a metal washer 18, which latter is also formed with a down wardly bent tooth 10 that is driven into the boa-rd, as shown in Fig. 3, and thus prevents the washer vrrr'nnturning on its axis. The washer is centrally apertured for the passage of the post 9, and the projecting portion or said post is encircled by a coinvpression spring 20. @ne end of the spring 2O is stepped on the washer 18 and its other end abuts against a washer 21 conhiied on the outer end or post 9 by a cotter-pin 22.

The spring thus exerts a thrustonV the .post 9 which is resisted only by the contact finger 11, thus insuring a perfect electric contact Vwith either lofl the strips Tand 8, and also firmly holding vthe finger 11 in intermediate or neutral position in contact with the board, and thus preventing any accidental closing or either circuit. The

washer 18 loosely its the post 9 in order to strips,

switch, the spring 2O i nently strained, and always reacts to give the the washer to turn Vwith the post, and they current is conducted to the post through the spring 20, abutment washer 21 and c-otter Din 22. Y 1 From the foregoing it will be apparent how the described structure effectuates the stated purposes or objects of the invention. Since the post 9 can turn freely in the washer 18,

stationary and there can be Vno twisting or turning of the circuit wire 16, which, in other constructions moves, and often breaks atthis point. The action of the spring 2O always causes the finger 111to have a positive spring pressure contact with either of the or with the surface of the board between the strips; and this contact is manifestly unaffected by swellinOP or shrinking of the wood of the recording switch-board or mechanical variation in length et the switch post. The narrow structure of' the switches also permits the grouping of a plurality ot switches on very close centers on the board. Finally, no matter how hard or far the post may be pulled out when operating the cannot. be perinapositive pressure contact described. Moreover, by forming the contact finger or prong 11 from the stock of the knob or handle 10, simplicity terial are secured.

Although lI have shown and described my invention as embodied in a recorder switch for organs, and contemplate that such will be its principal use, it is manifest that the principle of the invention may lind embodiment in circuit controlling switchestor other purposes and in other relations. Hence the invention is not limited to a recorder switch, nor to the vprecise details of structure and arrangement shown, but may be modiiied and varied within the the appended claims.

1. In a rotary electric switch, the combination of a switch-board, a switch post rotatably mounted in said board, a fixed contact member on asurface ot said board at one side of said switch post, an operating knob on one end of said post, a contact tinger cut and bent outwardly from said knob, anda spring forcing said post endwise in a direction to .press said finger against said contact member.

2.,v In a rotary electric switch, the combination of a switchboard, a'switch post rotatably mounted in said board, a washer encircling said post and and the latter is locked to the:

board against turning, the arm 17 is always Va spring abutment on its of'structure and economy ot ma-V purview and scope ot' formed with a prong Y driven into said board and with a radially extended arm for connection to a circuitV wire, and a compression spring interposed between said washer and one end of said post, said washer,'spring and post constitutmg switch. t t Y Y 3. In a rotary electric switch, the combination of a switchboard, aswitch post rotatably mounted in saidjboard and carrying projecting end, a post and formed said board, and, radial outwardly` flat washer encircling 'said with a prong driven into opposite said prong, with a currentconducting elementsV Aof the.v

inclined arm for connection to 'a circuit wire, Y

and a coil compression spring encircling said post between said washer and said abutment ;V said 'washer spring, spring abutment and post constituting current-conducting Y elements of the switch.

4:. In an'electric switch of the character described, the combination of a switchboard, a metal switch post rotatably mounted 'in and projecting in rear ot' Vsaid board, a fixed contact member on and flushV with the front surface of said board at one side of saidf post,= a Vlaterally Vextending contact finger carried by Vsaid out ofcontact with 'said fixed contact mem-V ber under a turning movement of said post, a 1washer encircling said post'Y on the rear side of said board and anchored Vagainst turning to said boarc, a circuit wire'eleo trically connected to said-washer, andv a thrust spring between and in current-conpost and movablefintoand du'cting relation to said washer and the projecting end of said post. j Y i In an electricswitch of the character described,-the combination ot' a switchboard, a metal switch post rotatably mounted in and projecting in rear of lsaid board, a pair or' xed contactmembers on andv flush with' the front surface of said board at opposite sides of, and equidistant from, said post, re'- spectively, a laterally extending inwardly bent contact inger carried by said post, a tlat washer encircling said post on the rear side:

anchored against turning ot said board and to said board, an outwardly inclined radial arm on said washer, acircuit wire electrically connected to said arm,and` a coil compression spring encircling said post between, and in current-conducting relation to, said washer and the projectingend oitsaid post. 6. In a rotary electric switch, a round switch post having an integral widenedand flattened knob formed as `a longitudinal eX- tension thereof, and a contact Grenen CHAPMAN;

ting-er cutand Abent outwardly Vfromsaid kno Y 

